如何使用Powermock模拟void静态方法抛出异常？ [英] How to mock a void static method to throw exception with Powermock?

问题描述

我正在尝试使用Powermock和Mockito来模拟一个void静态方法来抛出异常，如下所示。但我遇到了一个问题。除非我使用相同的参数对Adder.add（）进行两次调用，否则不会抛出模拟的 IOException 。

I am trying to use Powermock and Mockito to mock a void static method to throw exception as below. But I met a problem. Unless I make the two invocations of Adder.add() with the same argument, the mocked IOException won't be thrown.

BTW，我添加了 @RunWith（PowerMockRunner.class）和 @PrepareForTest（Adder.class）到单元测试类。

BTW, I've added @RunWith(PowerMockRunner.class) and @PrepareForTest(Adder.class) to the unit test class.

class Adder{
    public static void add(int i) throws IOException{
        return;
    }
}

@Test
public void testAdder() throws IOException{
    PowerMockito.mockStatic(Adder.class);
    PowerMockito.doThrow(new IOException()).when(Adder.class);
    Adder.add(12);
    try {
        Adder.add(11);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    // assert things 
}

提前致谢。 ：）

答案如下。

咨询后 http://code.google.com/p/powermock/issues/detail?id= 278 ，实际上上面的Adder.add（12）是设置模拟静态方法的一部分。这意味着在使用参数12调用Adder.add（）时，将抛出IOException。这很难理解，对吧？ :)所以它应该写成如下。

After consulting here http://code.google.com/p/powermock/issues/detail?id=278 , in fact Adder.add(12) above is part of setting up mock static method. It means when invoking Adder.add() with argument 12, IOException will be thrown. It is hard to understand, right? :) So it should be written as below.

PowerMockito.mockStatic(Adder.class);
PowerMockito.doThrow(new IOException()).when(Adder.class);
Adder.add(anyInt());

推荐答案

答案如下。

在此处咨询后 http://code.google.com/p/powermock/issues/detail?id=278 ，实际上上面的Adder.add（12）是设置模拟静态方法的一部分。这意味着在使用参数12调用Adder.add（）时，将抛出IOException。这很难理解，对吧？ :)所以它应该写成如下。

After consulting here http://code.google.com/p/powermock/issues/detail?id=278 , in fact Adder.add(12) above is part of setting up mock static method. It means when invoking Adder.add() with argument 12, IOException will be thrown. It is hard to understand, right? :) So it should be written as below.

PowerMockito.mockStatic(Adder.class);
PowerMockito.doThrow(new IOException()).when(Adder.class);
Adder.add(anyInt());

编辑：

链接已死，请尝试互联网档案一个而不是。

这篇关于如何使用Powermock模拟void静态方法抛出异常？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！